yeah, that would probably work, but I would put it in line with the sub amp only, that way all the power is reserved for all those bass hits. Highs playing wont really drain the battery as much.
If you've got more than one amp, get two separate distribution blocks...one for sub amps, one for highs/mids amp(s) and put the cap in line before the sub amp distribution block.
If you've got more than one amp, get two separate distribution blocks...one for sub amps, one for highs/mids amp(s) and put the cap in line before the sub amp distribution block.